Which of the following groups contains reactive elements that need to gain only one electron to have a full outer energy level? alkali metals alkaline earth metals halogens noble gases

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1